Closing Comments
If you were being really thorough, you could drain as I did then fill with water then drain again, before refilling. I didn't as I change the coolant every 3 to 4 years and the longlife stuff is good for 5, so its not an issue if a little of the old stuff is left.
It's a good idea to keep an eye on the level in the coolant bottle for a few days after the job in case it drops due to air escaping or if you have a leak.
If you have to top up, make sure the engine is cold before removing the cap from the expansion bottle.
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